drivers/iio/adc/rtq6056.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2022 Richtek Technology Corp.
   4  *
   5  * ChiYuan Huang <[email protected]>
   6  */
   7
   8 #include <linux/bitops.h>
   9 #include <linux/delay.h>
  10 #include <linux/i2c.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/module.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/property.h>
  16 #include <linux/regmap.h>
  17 #include <linux/sysfs.h>
  18 #include <linux/types.h>
  19 #include <linux/util_macros.h>
  20
  21 #include <linux/iio/buffer.h>
  22 #include <linux/iio/iio.h>
  23 #include <linux/iio/sysfs.h>
  24 #include <linux/iio/trigger_consumer.h>
  25 #include <linux/iio/triggered_buffer.h>
  26
  27 #define RTQ6056_REG_CONFIG      0x00
  28 #define RTQ6056_REG_SHUNTVOLT   0x01
  29 #define RTQ6056_REG_BUSVOLT     0x02
  30 #define RTQ6056_REG_POWER       0x03
  31 #define RTQ6056_REG_CURRENT     0x04
  32 #define RTQ6056_REG_CALIBRATION 0x05
  33 #define RTQ6056_REG_MASKENABLE  0x06
  34 #define RTQ6056_REG_ALERTLIMIT  0x07
  35 #define RTQ6056_REG_MANUFACTID  0xFE
  36 #define RTQ6056_REG_DIEID       0xFF
  37
  38 #define RTQ6056_VENDOR_ID       0x1214
  39 #define RTQ6056_DEFAULT_CONFIG  0x4127
  40 #define RTQ6056_CONT_ALLON      7
  41
  42 #define RTQ6059_DEFAULT_CONFIG  0x3C47
  43 #define RTQ6059_VBUS_LSB_OFFSET 3
  44 #define RTQ6059_AVG_BASE        8
  45
  46 enum {
  47         RTQ6056_CH_VSHUNT = 0,
  48         RTQ6056_CH_VBUS,
  49         RTQ6056_CH_POWER,
  50         RTQ6056_CH_CURRENT,
  51         RTQ6056_MAX_CHANNEL
  52 };
  53
  54 /*
  55  * The enum is to present the 0x00 CONFIG RG bitfield for the 16bit RG value
  56  * field value order from LSB to MSB
  57  * RTQ6053/6 is OPMODE->VSHUNTCT->VBUSCT->AVG->RESET
  58  * RTQ6059 is OPMODE->SADC->BADC->PGA->RESET
  59  */
  60 enum {
  61         F_OPMODE = 0,
  62         F_VSHUNTCT,
  63         F_RTQ6059_SADC = F_VSHUNTCT,
  64         F_VBUSCT,
  65         F_RTQ6059_BADC = F_VBUSCT,
  66         F_AVG,
  67         F_RTQ6059_PGA = F_AVG,
  68         F_RESET,
  69         F_MAX_FIELDS
  70 };
  71
  72 struct rtq6056_priv;
  73
  74 struct richtek_dev_data {
  75         bool fixed_samp_freq;
  76         u8 vbus_offset;
  77         int default_conv_time_us;
  78         unsigned int default_config;
  79         unsigned int calib_coefficient;
  80         const int *avg_sample_list;
  81         int avg_sample_list_length;
  82         const struct reg_field *reg_fields;
  83         const struct iio_chan_spec *channels;
  84         int num_channels;
  85         int (*read_scale)(struct iio_chan_spec const *ch, int *val, int *val2);
  86         int (*set_average)(struct rtq6056_priv *priv, int val);
  87 };
  88
  89 struct rtq6056_priv {
  90         struct device *dev;
  91         struct regmap *regmap;
  92         struct regmap_field *rm_fields[F_MAX_FIELDS];
  93         const struct richtek_dev_data *devdata;
  94         u32 shunt_resistor_uohm;
  95         int vshuntct_us;
  96         int vbusct_us;
  97         int avg_sample;
  98 };
  99
 100 static const struct reg_field rtq6056_reg_fields[F_MAX_FIELDS] = {
 101         [F_OPMODE] = REG_FIELD(RTQ6056_REG_CONFIG, 0, 2),
 102         [F_VSHUNTCT] = REG_FIELD(RTQ6056_REG_CONFIG, 3, 5),
 103         [F_VBUSCT] = REG_FIELD(RTQ6056_REG_CONFIG, 6, 8),
 104         [F_AVG] = REG_FIELD(RTQ6056_REG_CONFIG, 9, 11),
 105         [F_RESET] = REG_FIELD(RTQ6056_REG_CONFIG, 15, 15),
 106 };
 107
 108 static const struct reg_field rtq6059_reg_fields[F_MAX_FIELDS] = {
 109         [F_OPMODE] = REG_FIELD(RTQ6056_REG_CONFIG, 0, 2),
 110         [F_RTQ6059_SADC] = REG_FIELD(RTQ6056_REG_CONFIG, 3, 6),
 111         [F_RTQ6059_BADC] = REG_FIELD(RTQ6056_REG_CONFIG, 7, 10),
 112         [F_RTQ6059_PGA] = REG_FIELD(RTQ6056_REG_CONFIG, 11, 12),
 113         [F_RESET] = REG_FIELD(RTQ6056_REG_CONFIG, 15, 15),
 114 };
 115
 116 static const struct iio_chan_spec rtq6056_channels[RTQ6056_MAX_CHANNEL + 1] = {
 117         {
 118                 .type = IIO_VOLTAGE,
 119                 .indexed = 1,
 120                 .channel = 0,
 121                 .address = RTQ6056_REG_SHUNTVOLT,
 122                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 123                                       BIT(IIO_CHAN_INFO_SCALE) |
 124                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 125                 .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 126                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 127                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 128                 .scan_index = 0,
 129                 .scan_type = {
 130                         .sign = 's',
 131                         .realbits = 16,
 132                         .storagebits = 16,
 133                         .endianness = IIO_CPU,
 134                 },
 135         },
 136         {
 137                 .type = IIO_VOLTAGE,
 138                 .indexed = 1,
 139                 .channel = 1,
 140                 .address = RTQ6056_REG_BUSVOLT,
 141                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 142                                       BIT(IIO_CHAN_INFO_SCALE) |
 143                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 144                 .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 145                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 146                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 147                 .scan_index = 1,
 148                 .scan_type = {
 149                         .sign = 'u',
 150                         .realbits = 16,
 151                         .storagebits = 16,
 152                         .endianness = IIO_CPU,
 153                 },
 154         },
 155         {
 156                 .type = IIO_POWER,
 157                 .indexed = 1,
 158                 .channel = 2,
 159                 .address = RTQ6056_REG_POWER,
 160                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 161                                       BIT(IIO_CHAN_INFO_SCALE) |
 162                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 163                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 164                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 165                 .scan_index = 2,
 166                 .scan_type = {
 167                         .sign = 'u',
 168                         .realbits = 16,
 169                         .storagebits = 16,
 170                         .endianness = IIO_CPU,
 171                 },
 172         },
 173         {
 174                 .type = IIO_CURRENT,
 175                 .indexed = 1,
 176                 .channel = 3,
 177                 .address = RTQ6056_REG_CURRENT,
 178                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 179                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 180                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 181                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 182                 .scan_index = 3,
 183                 .scan_type = {
 184                         .sign = 's',
 185                         .realbits = 16,
 186                         .storagebits = 16,
 187                         .endianness = IIO_CPU,
 188                 },
 189         },
 190         IIO_CHAN_SOFT_TIMESTAMP(RTQ6056_MAX_CHANNEL),
 191 };
 192
 193 /*
 194  * Difference between RTQ6056 and RTQ6059
 195  * - Fixed sampling conversion time
 196  * - Average sample numbers
 197  * - Channel scale
 198  * - calibration coefficient
 199  */
 200 static const struct iio_chan_spec rtq6059_channels[RTQ6056_MAX_CHANNEL + 1] = {
 201         {
 202                 .type = IIO_VOLTAGE,
 203                 .indexed = 1,
 204                 .channel = 0,
 205                 .address = RTQ6056_REG_SHUNTVOLT,
 206                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 207                                       BIT(IIO_CHAN_INFO_SCALE) |
 208                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 209                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 210                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 211                 .scan_index = 0,
 212                 .scan_type = {
 213                         .sign = 's',
 214                         .realbits = 16,
 215                         .storagebits = 16,
 216                         .endianness = IIO_CPU,
 217                 },
 218         },
 219         {
 220                 .type = IIO_VOLTAGE,
 221                 .indexed = 1,
 222                 .channel = 1,
 223                 .address = RTQ6056_REG_BUSVOLT,
 224                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 225                                       BIT(IIO_CHAN_INFO_SCALE) |
 226                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 227                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 228                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 229                 .scan_index = 1,
 230                 .scan_type = {
 231                         .sign = 'u',
 232                         .realbits = 16,
 233                         .storagebits = 16,
 234                         .endianness = IIO_CPU,
 235                 },
 236         },
 237         {
 238                 .type = IIO_POWER,
 239                 .indexed = 1,
 240                 .channel = 2,
 241                 .address = RTQ6056_REG_POWER,
 242                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 243                                       BIT(IIO_CHAN_INFO_SCALE) |
 244                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 245                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 246                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 247                 .scan_index = 2,
 248                 .scan_type = {
 249                         .sign = 'u',
 250                         .realbits = 16,
 251                         .storagebits = 16,
 252                         .endianness = IIO_CPU,
 253                 },
 254         },
 255         {
 256                 .type = IIO_CURRENT,
 257                 .indexed = 1,
 258                 .channel = 3,
 259                 .address = RTQ6056_REG_CURRENT,
 260                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 261                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 262                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 263                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
 264                 .scan_index = 3,
 265                 .scan_type = {
 266                         .sign = 's',
 267                         .realbits = 16,
 268                         .storagebits = 16,
 269                         .endianness = IIO_CPU,
 270                 },
 271         },
 272         IIO_CHAN_SOFT_TIMESTAMP(RTQ6056_MAX_CHANNEL),
 273 };
 274
 275 static int rtq6056_adc_read_channel(struct rtq6056_priv *priv,
 276                                     struct iio_chan_spec const *ch,
 277                                     int *val)
 278 {
 279         const struct richtek_dev_data *devdata = priv->devdata;
 280         struct device *dev = priv->dev;
 281         unsigned int addr = ch->address;
 282         unsigned int regval;
 283         int ret;
 284
 285         pm_runtime_get_sync(dev);
 286         ret = regmap_read(priv->regmap, addr, &regval);
 287         pm_runtime_mark_last_busy(dev);
 288         pm_runtime_put(dev);
 289         if (ret)
 290                 return ret;
 291
 292         /* Power and VBUS is unsigned 16-bit, others are signed 16-bit */
 293         switch (addr) {
 294         case RTQ6056_REG_BUSVOLT:
 295                 regval >>= devdata->vbus_offset;
 296                 *val = regval;
 297                 return IIO_VAL_INT;
 298         case RTQ6056_REG_POWER:
 299                 *val = regval;
 300                 return IIO_VAL_INT;
 301         case RTQ6056_REG_SHUNTVOLT:
 302         case RTQ6056_REG_CURRENT:
 303                 *val = sign_extend32(regval, 16);
 304                 return IIO_VAL_INT;
 305         default:
 306                 return -EINVAL;
 307         }
 308 }
 309
 310 static int rtq6056_adc_read_scale(struct iio_chan_spec const *ch, int *val,
 311                                   int *val2)
 312 {
 313         switch (ch->address) {
 314         case RTQ6056_REG_SHUNTVOLT:
 315                 /* VSHUNT lsb  2.5uV */
 316                 *val = 2500;
 317                 *val2 = 1000000;
 318                 return IIO_VAL_FRACTIONAL;
 319         case RTQ6056_REG_BUSVOLT:
 320                 /* VBUS lsb 1.25mV */
 321                 *val = 1250;
 322                 *val2 = 1000;
 323                 return IIO_VAL_FRACTIONAL;
 324         case RTQ6056_REG_POWER:
 325                 /* Power lsb 25mW */
 326                 *val = 25;
 327                 return IIO_VAL_INT;
 328         default:
 329                 return -EINVAL;
 330         }
 331 }
 332
 333 static int rtq6059_adc_read_scale(struct iio_chan_spec const *ch, int *val,
 334                                   int *val2)
 335 {
 336         switch (ch->address) {
 337         case RTQ6056_REG_SHUNTVOLT:
 338                 /* VSHUNT lsb  10uV */
 339                 *val = 10000;
 340                 *val2 = 1000000;
 341                 return IIO_VAL_FRACTIONAL;
 342         case RTQ6056_REG_BUSVOLT:
 343                 /* VBUS lsb 4mV */
 344                 *val = 4;
 345                 return IIO_VAL_INT;
 346         case RTQ6056_REG_POWER:
 347                 /* Power lsb 20mW */
 348                 *val = 20;
 349                 return IIO_VAL_INT;
 350         default:
 351                 return -EINVAL;
 352         }
 353 }
 354
 355 /*
 356  * Sample frequency for channel VSHUNT and VBUS. The indices correspond
 357  * with the bit value expected by the chip. And it can be found at
 358  * https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
 359  */
 360 static const int rtq6056_samp_freq_list[] = {
 361         7194, 4926, 3717, 1904, 964, 485, 243, 122,
 362 };
 363
 364 static int rtq6056_adc_set_samp_freq(struct rtq6056_priv *priv,
 365                                      struct iio_chan_spec const *ch, int val)
 366 {
 367         struct regmap_field *rm_field;
 368         unsigned int selector;
 369         int *ct, ret;
 370
 371         if (val > 7194 || val < 122)
 372                 return -EINVAL;
 373
 374         if (ch->address == RTQ6056_REG_SHUNTVOLT) {
 375                 rm_field = priv->rm_fields[F_VSHUNTCT];
 376                 ct = &priv->vshuntct_us;
 377         } else if (ch->address == RTQ6056_REG_BUSVOLT) {
 378                 rm_field = priv->rm_fields[F_VBUSCT];
 379                 ct = &priv->vbusct_us;
 380         } else
 381                 return -EINVAL;
 382
 383         selector = find_closest_descending(val, rtq6056_samp_freq_list,
 384                                            ARRAY_SIZE(rtq6056_samp_freq_list));
 385
 386         ret = regmap_field_write(rm_field, selector);
 387         if (ret)
 388                 return ret;
 389
 390         *ct = 1000000 / rtq6056_samp_freq_list[selector];
 391
 392         return 0;
 393 }
 394
 395 /*
 396  * Available averaging rate for rtq6056. The indices correspond with the bit
 397  * value expected by the chip. And it can be found at
 398  * https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
 399  */
 400 static const int rtq6056_avg_sample_list[] = {
 401         1, 4, 16, 64, 128, 256, 512, 1024,
 402 };
 403
 404 static const int rtq6059_avg_sample_list[] = {
 405         1, 2, 4, 8, 16, 32, 64, 128,
 406 };
 407
 408 static int rtq6056_adc_set_average(struct rtq6056_priv *priv, int val)
 409 {
 410         unsigned int selector;
 411         int ret;
 412
 413         if (val > 1024 || val < 1)
 414                 return -EINVAL;
 415
 416         selector = find_closest(val, rtq6056_avg_sample_list,
 417                                 ARRAY_SIZE(rtq6056_avg_sample_list));
 418
 419         ret = regmap_field_write(priv->rm_fields[F_AVG], selector);
 420         if (ret)
 421                 return ret;
 422
 423         priv->avg_sample = rtq6056_avg_sample_list[selector];
 424
 425         return 0;
 426 }
 427
 428 static int rtq6059_adc_set_average(struct rtq6056_priv *priv, int val)
 429 {
 430         unsigned int selector;
 431         int ret;
 432
 433         if (val > 128 || val < 1)
 434                 return -EINVAL;
 435
 436         /* The supported average sample is 2^x (x from 0 to 7) */
 437         selector = fls(val) - 1;
 438
 439         ret = regmap_field_write(priv->rm_fields[F_RTQ6059_BADC],
 440                                  RTQ6059_AVG_BASE + selector);
 441         if (ret)
 442                 return ret;
 443
 444         ret = regmap_field_write(priv->rm_fields[F_RTQ6059_SADC],
 445                                  RTQ6059_AVG_BASE + selector);
 446
 447         priv->avg_sample = BIT(selector);
 448
 449         return 0;
 450 }
 451
 452 static int rtq6056_adc_get_sample_freq(struct rtq6056_priv *priv,
 453                                        struct iio_chan_spec const *ch, int *val)
 454 {
 455         int sample_time;
 456
 457         if (ch->address == RTQ6056_REG_SHUNTVOLT)
 458                 sample_time = priv->vshuntct_us;
 459         else if (ch->address == RTQ6056_REG_BUSVOLT)
 460                 sample_time = priv->vbusct_us;
 461         else {
 462                 sample_time = priv->vshuntct_us + priv->vbusct_us;
 463                 sample_time *= priv->avg_sample;
 464         }
 465
 466         *val = 1000000 / sample_time;
 467
 468         return IIO_VAL_INT;
 469 }
 470
 471 static int rtq6056_adc_read_raw(struct iio_dev *indio_dev,
 472                                 struct iio_chan_spec const *chan, int *val,
 473                                 int *val2, long mask)
 474 {
 475         struct rtq6056_priv *priv = iio_priv(indio_dev);
 476         const struct richtek_dev_data *devdata = priv->devdata;
 477
 478         switch (mask) {
 479         case IIO_CHAN_INFO_RAW:
 480                 return rtq6056_adc_read_channel(priv, chan, val);
 481         case IIO_CHAN_INFO_SCALE:
 482                 return devdata->read_scale(chan, val, val2);
 483         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 484                 *val = priv->avg_sample;
 485                 return IIO_VAL_INT;
 486         case IIO_CHAN_INFO_SAMP_FREQ:
 487                 return rtq6056_adc_get_sample_freq(priv, chan, val);
 488         default:
 489                 return -EINVAL;
 490         }
 491 }
 492
 493 static int rtq6056_adc_read_avail(struct iio_dev *indio_dev,
 494                                   struct iio_chan_spec const *chan,
 495                                   const int **vals, int *type, int *length,
 496                                   long mask)
 497 {
 498         struct rtq6056_priv *priv = iio_priv(indio_dev);
 499         const struct richtek_dev_data *devdata = priv->devdata;
 500
 501         switch (mask) {
 502         case IIO_CHAN_INFO_SAMP_FREQ:
 503                 *vals = rtq6056_samp_freq_list;
 504                 *type = IIO_VAL_INT;
 505                 *length = ARRAY_SIZE(rtq6056_samp_freq_list);
 506                 return IIO_AVAIL_LIST;
 507         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 508                 *vals = devdata->avg_sample_list;
 509                 *length = devdata->avg_sample_list_length;
 510                 *type = IIO_VAL_INT;
 511                 return IIO_AVAIL_LIST;
 512         default:
 513                 return -EINVAL;
 514         }
 515 }
 516
 517 static int rtq6056_adc_write_raw(struct iio_dev *indio_dev,
 518                                  struct iio_chan_spec const *chan, int val,
 519                                  int val2, long mask)
 520 {
 521         struct rtq6056_priv *priv = iio_priv(indio_dev);
 522         const struct richtek_dev_data *devdata = priv->devdata;
 523
 524         iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
 525                 switch (mask) {
 526                 case IIO_CHAN_INFO_SAMP_FREQ:
 527                         if (devdata->fixed_samp_freq)
 528                                 return -EINVAL;
 529                         return rtq6056_adc_set_samp_freq(priv, chan, val);
 530                 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 531                         return devdata->set_average(priv, val);
 532                 default:
 533                         return -EINVAL;
 534                 }
 535         }
 536         unreachable();
 537 }
 538
 539 static const char *rtq6056_channel_labels[RTQ6056_MAX_CHANNEL] = {
 540         [RTQ6056_CH_VSHUNT] = "Vshunt",
 541         [RTQ6056_CH_VBUS] = "Vbus",
 542         [RTQ6056_CH_POWER] = "Power",
 543         [RTQ6056_CH_CURRENT] = "Current",
 544 };
 545
 546 static int rtq6056_adc_read_label(struct iio_dev *indio_dev,
 547                                   struct iio_chan_spec const *chan,
 548                                   char *label)
 549 {
 550         return sysfs_emit(label, "%s\n", rtq6056_channel_labels[chan->channel]);
 551 }
 552
 553 static int rtq6056_set_shunt_resistor(struct rtq6056_priv *priv,
 554                                       int resistor_uohm)
 555 {
 556         const struct richtek_dev_data *devdata = priv->devdata;
 557         unsigned int calib_val;
 558         int ret;
 559
 560         if (resistor_uohm <= 0) {
 561                 dev_err(priv->dev, "Invalid resistor [%d]\n", resistor_uohm);
 562                 return -EINVAL;
 563         }
 564
 565         /* calibration = coefficient / (Rshunt (uOhm) * current lsb (1mA)) */
 566         calib_val = devdata->calib_coefficient / resistor_uohm;
 567         ret = regmap_write(priv->regmap, RTQ6056_REG_CALIBRATION, calib_val);
 568         if (ret)
 569                 return ret;
 570
 571         priv->shunt_resistor_uohm = resistor_uohm;
 572
 573         return 0;
 574 }
 575
 576 static ssize_t shunt_resistor_show(struct device *dev,
 577                                    struct device_attribute *attr, char *buf)
 578 {
 579         struct rtq6056_priv *priv = iio_priv(dev_to_iio_dev(dev));
 580         int vals[2] = { priv->shunt_resistor_uohm, 1000000 };
 581
 582         return iio_format_value(buf, IIO_VAL_FRACTIONAL, 1, vals);
 583 }
 584
 585 static ssize_t shunt_resistor_store(struct device *dev,
 586                                     struct device_attribute *attr,
 587                                     const char *buf, size_t len)
 588 {
 589         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 590         struct rtq6056_priv *priv = iio_priv(indio_dev);
 591         int val, val_fract, ret;
 592
 593         ret = iio_device_claim_direct_mode(indio_dev);
 594         if (ret)
 595                 return ret;
 596
 597         ret = iio_str_to_fixpoint(buf, 100000, &val, &val_fract);
 598         if (ret)
 599                 goto out_store;
 600
 601         ret = rtq6056_set_shunt_resistor(priv, val * 1000000 + val_fract);
 602
 603 out_store:
 604         iio_device_release_direct_mode(indio_dev);
 605
 606         return ret ?: len;
 607 }
 608
 609 static IIO_DEVICE_ATTR_RW(shunt_resistor, 0);
 610
 611 static struct attribute *rtq6056_attributes[] = {
 612         &iio_dev_attr_shunt_resistor.dev_attr.attr,
 613         NULL
 614 };
 615
 616 static const struct attribute_group rtq6056_attribute_group = {
 617         .attrs = rtq6056_attributes,
 618 };
 619
 620 static const struct iio_info rtq6056_info = {
 621         .attrs = &rtq6056_attribute_group,
 622         .read_raw = rtq6056_adc_read_raw,
 623         .read_avail = rtq6056_adc_read_avail,
 624         .write_raw = rtq6056_adc_write_raw,
 625         .read_label = rtq6056_adc_read_label,
 626 };
 627
 628 static irqreturn_t rtq6056_buffer_trigger_handler(int irq, void *p)
 629 {
 630         struct iio_poll_func *pf = p;
 631         struct iio_dev *indio_dev = pf->indio_dev;
 632         struct rtq6056_priv *priv = iio_priv(indio_dev);
 633         const struct richtek_dev_data *devdata = priv->devdata;
 634         struct device *dev = priv->dev;
 635         struct {
 636                 u16 vals[RTQ6056_MAX_CHANNEL];
 637                 s64 timestamp __aligned(8);
 638         } data;
 639         unsigned int raw;
 640         int i = 0, bit, ret;
 641
 642         memset(&data, 0, sizeof(data));
 643
 644         pm_runtime_get_sync(dev);
 645
 646         iio_for_each_active_channel(indio_dev, bit) {
 647                 unsigned int addr = rtq6056_channels[bit].address;
 648
 649                 ret = regmap_read(priv->regmap, addr, &raw);
 650                 if (ret)
 651                         goto out;
 652
 653                 if (addr == RTQ6056_REG_BUSVOLT)
 654                         raw >>= devdata->vbus_offset;
 655
 656                 data.vals[i++] = raw;
 657         }
 658
 659         iio_push_to_buffers_with_timestamp(indio_dev, &data, iio_get_time_ns(indio_dev));
 660
 661 out:
 662         pm_runtime_mark_last_busy(dev);
 663         pm_runtime_put(dev);
 664
 665         iio_trigger_notify_done(indio_dev->trig);
 666
 667         return IRQ_HANDLED;
 668 }
 669
 670 static void rtq6056_enter_shutdown_state(void *dev)
 671 {
 672         struct rtq6056_priv *priv = dev_get_drvdata(dev);
 673
 674         /* Enter shutdown state */
 675         regmap_field_write(priv->rm_fields[F_OPMODE], 0);
 676 }
 677
 678 static bool rtq6056_is_readable_reg(struct device *dev, unsigned int reg)
 679 {
 680         switch (reg) {
 681         case RTQ6056_REG_CONFIG ... RTQ6056_REG_ALERTLIMIT:
 682         case RTQ6056_REG_MANUFACTID ... RTQ6056_REG_DIEID:
 683                 return true;
 684         default:
 685                 return false;
 686         }
 687 }
 688
 689 static bool rtq6056_is_writeable_reg(struct device *dev, unsigned int reg)
 690 {
 691         switch (reg) {
 692         case RTQ6056_REG_CONFIG:
 693         case RTQ6056_REG_CALIBRATION ... RTQ6056_REG_ALERTLIMIT:
 694                 return true;
 695         default:
 696                 return false;
 697         }
 698 }
 699
 700 static const struct regmap_config rtq6056_regmap_config = {
 701         .reg_bits = 8,
 702         .val_bits = 16,
 703         .val_format_endian = REGMAP_ENDIAN_BIG,
 704         .max_register = RTQ6056_REG_DIEID,
 705         .readable_reg = rtq6056_is_readable_reg,
 706         .writeable_reg = rtq6056_is_writeable_reg,
 707 };
 708
 709 static int rtq6056_probe(struct i2c_client *i2c)
 710 {
 711         struct iio_dev *indio_dev;
 712         struct rtq6056_priv *priv;
 713         struct device *dev = &i2c->dev;
 714         struct regmap *regmap;
 715         const struct richtek_dev_data *devdata;
 716         unsigned int vendor_id, shunt_resistor_uohm;
 717         int ret;
 718
 719         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 720                 return -EOPNOTSUPP;
 721
 722         devdata = device_get_match_data(dev);
 723         if (!devdata)
 724                 return dev_err_probe(dev, -EINVAL, "Invalid dev data\n");
 725
 726         indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
 727         if (!indio_dev)
 728                 return -ENOMEM;
 729
 730         priv = iio_priv(indio_dev);
 731         priv->dev = dev;
 732         priv->vshuntct_us = priv->vbusct_us = devdata->default_conv_time_us;
 733         priv->avg_sample = 1;
 734         priv->devdata = devdata;
 735         i2c_set_clientdata(i2c, priv);
 736
 737         regmap = devm_regmap_init_i2c(i2c, &rtq6056_regmap_config);
 738         if (IS_ERR(regmap))
 739                 return dev_err_probe(dev, PTR_ERR(regmap),
 740                                      "Failed to init regmap\n");
 741
 742         priv->regmap = regmap;
 743
 744         ret = regmap_read(regmap, RTQ6056_REG_MANUFACTID, &vendor_id);
 745         if (ret)
 746                 return dev_err_probe(dev, ret,
 747                                      "Failed to get manufacturer info\n");
 748
 749         if (vendor_id != RTQ6056_VENDOR_ID)
 750                 return dev_err_probe(dev, -ENODEV,
 751                                      "Invalid vendor id 0x%04x\n", vendor_id);
 752
 753         ret = devm_regmap_field_bulk_alloc(dev, regmap, priv->rm_fields,
 754                                            devdata->reg_fields, F_MAX_FIELDS);
 755         if (ret)
 756                 return dev_err_probe(dev, ret, "Failed to init regmap field\n");
 757
 758         ret = regmap_write(regmap, RTQ6056_REG_CONFIG, devdata->default_config);
 759         if (ret)
 760                 return dev_err_probe(dev, ret,
 761                                      "Failed to enable continuous sensing\n");
 762
 763         ret = devm_add_action_or_reset(dev, rtq6056_enter_shutdown_state, dev);
 764         if (ret)
 765                 return ret;
 766
 767         pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
 768         pm_runtime_use_autosuspend(dev);
 769         pm_runtime_set_active(dev);
 770         pm_runtime_mark_last_busy(dev);
 771         ret = devm_pm_runtime_enable(dev);
 772         if (ret)
 773                 return dev_err_probe(dev, ret, "Failed to enable pm_runtime\n");
 774
 775         /* By default, use 2000 micro-Ohm resistor */
 776         shunt_resistor_uohm = 2000;
 777         device_property_read_u32(dev, "shunt-resistor-micro-ohms",
 778                                  &shunt_resistor_uohm);
 779
 780         ret = rtq6056_set_shunt_resistor(priv, shunt_resistor_uohm);
 781         if (ret)
 782                 return dev_err_probe(dev, ret,
 783                                      "Failed to init shunt resistor\n");
 784
 785         indio_dev->name = "rtq6056";
 786         indio_dev->modes = INDIO_DIRECT_MODE;
 787         indio_dev->channels = devdata->channels;
 788         indio_dev->num_channels = devdata->num_channels;
 789         indio_dev->info = &rtq6056_info;
 790
 791         ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
 792                                               rtq6056_buffer_trigger_handler,
 793                                               NULL);
 794         if (ret)
 795                 return dev_err_probe(dev, ret,
 796                                      "Failed to allocate iio trigger buffer\n");
 797
 798         return devm_iio_device_register(dev, indio_dev);
 799 }
 800
 801 static int rtq6056_runtime_suspend(struct device *dev)
 802 {
 803         struct rtq6056_priv *priv = dev_get_drvdata(dev);
 804
 805         /* Configure to shutdown mode */
 806         return regmap_field_write(priv->rm_fields[F_OPMODE], 0);
 807 }
 808
 809 static int rtq6056_runtime_resume(struct device *dev)
 810 {
 811         struct rtq6056_priv *priv = dev_get_drvdata(dev);
 812         int sample_rdy_time_us, ret;
 813
 814         ret = regmap_field_write(priv->rm_fields[F_OPMODE], RTQ6056_CONT_ALLON);
 815         if (ret)
 816                 return ret;
 817
 818         sample_rdy_time_us = priv->vbusct_us + priv->vshuntct_us;
 819         sample_rdy_time_us *= priv->avg_sample;
 820
 821         usleep_range(sample_rdy_time_us, sample_rdy_time_us + 100);
 822
 823         return 0;
 824 }
 825
 826 static DEFINE_RUNTIME_DEV_PM_OPS(rtq6056_pm_ops, rtq6056_runtime_suspend,
 827                                  rtq6056_runtime_resume, NULL);
 828
 829 static const struct richtek_dev_data rtq6056_devdata = {
 830         .default_conv_time_us = 1037,
 831         .calib_coefficient = 5120000,
 832         /*
 833          * By default, configure average sample as 1, bus and shunt conversion
 834          * time as 1037 microsecond, and operating mode to all on.
 835          */
 836         .default_config = RTQ6056_DEFAULT_CONFIG,
 837         .avg_sample_list = rtq6056_avg_sample_list,
 838         .avg_sample_list_length = ARRAY_SIZE(rtq6056_avg_sample_list),
 839         .reg_fields = rtq6056_reg_fields,
 840         .channels = rtq6056_channels,
 841         .num_channels = ARRAY_SIZE(rtq6056_channels),
 842         .read_scale = rtq6056_adc_read_scale,
 843         .set_average = rtq6056_adc_set_average,
 844 };
 845
 846 static const struct richtek_dev_data rtq6059_devdata = {
 847         .fixed_samp_freq = true,
 848         .vbus_offset = RTQ6059_VBUS_LSB_OFFSET,
 849         .default_conv_time_us = 532,
 850         .calib_coefficient = 40960000,
 851         /*
 852          * By default, configure average sample as 1, bus and shunt conversion
 853          * time as 532 microsecond, and operating mode to all on.
 854          */
 855         .default_config = RTQ6059_DEFAULT_CONFIG,
 856         .avg_sample_list = rtq6059_avg_sample_list,
 857         .avg_sample_list_length = ARRAY_SIZE(rtq6059_avg_sample_list),
 858         .reg_fields = rtq6059_reg_fields,
 859         .channels = rtq6059_channels,
 860         .num_channels = ARRAY_SIZE(rtq6059_channels),
 861         .read_scale = rtq6059_adc_read_scale,
 862         .set_average = rtq6059_adc_set_average,
 863 };
 864
 865 static const struct of_device_id rtq6056_device_match[] = {
 866         { .compatible = "richtek,rtq6056", .data = &rtq6056_devdata },
 867         { .compatible = "richtek,rtq6059", .data = &rtq6059_devdata },
 868         { }
 869 };
 870 MODULE_DEVICE_TABLE(of, rtq6056_device_match);
 871
 872 static struct i2c_driver rtq6056_driver = {
 873         .driver = {
 874                 .name = "rtq6056",
 875                 .of_match_table = rtq6056_device_match,
 876                 .pm = pm_ptr(&rtq6056_pm_ops),
 877         },
 878         .probe = rtq6056_probe,
 879 };
 880 module_i2c_driver(rtq6056_driver);
 881
 882 MODULE_AUTHOR("ChiYuan Huang <[email protected]>");
 883 MODULE_DESCRIPTION("Richtek RTQ6056 Driver");
 884 MODULE_LICENSE("GPL v2");